17 Tonkin & Taylor Ltd Hazardous Substances Technical Assessment – Waihi North Project - Waihi Processing Plant, Water Treatment Plant and Development Site Oceana Gold (New Zealand) Limited June 2022 Job No: 1015212.1000 vRev0 Table 3.3: Hazardous substance volumes and classifications – Development Site Substance (UN Number) State Hazard Classification Proposed maximum volume Storage location and description Pre2021 Post-2021 ANFO (UN 0082) Solid 1.1D, 6.1D, 6.3B, 6.4A, 6.7B, 9.1D 1.1D – Substances and articles that have a mass explosion hazard Acute toxicity Category 4 (oral route) (See Note 1) Eye irritation Category 2 Carcinogenicity Category 2 Hazardous to the aquatic environment chronic Category 4 6,400 kg NEQ Development Site Class 1 storage area – split between five magazines Booster (UN 0042) Solid in plastic or cardboard casing 1.1D, 6.1C, 6.9B, 9.1B 1.1D – Substances and articles that have a mass explosion hazard Acute toxicity Category 3 (oral, dermal and inhalation route) Specific target organ toxicity – single exposure Category 2 Hazardous to the aquatic environment chronic Category 2 Packaged explosive (UN 0241) Plastic encapsulated emulsion 1.1D, 6.1D, 6.3A, 6.4A, 6.8C, 6.9A, 9.1A, 9.3C 1.1D – Substances and articles that have a mass explosion hazard Acute toxicity Category 4 (oral route) Skin irritant Category 1 Eye irritation Category 2 Reproductive toxicant Category 3 Specific target organ toxicity – repeated exposure Category 1 Hazardous to the aquatic environment Category 1 Harmful to terrestrial vertebrates Detonators (UN 0030 / UN 0456 / UN 0360) Solid 1.1B 1.1B - Substances and articles that have a mass explosion hazard 12,000 units (12 kg NEQ) Development Site Class 1 storage area – in one magazine
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